<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图区  -->
    <el-card>
      <!-- 警告区 -->
      <el-alert
        show-icon
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
      ></el-alert>

      <!-- 选择商品分类区 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChanged"
            expand-trigger="hover"
          >
          </el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe="">
            <!-- 展开行 -->
            <el-table-column type="expand"> 
              <template slot-scope="scope">
                 <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close = "handleClose(i, scope.row)">{{item}}</el-tag>
                 <!-- 输入的文本框 -->
                 <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                           @keyup.enter.native="handleInputConfirm(scope.row)"  @blur="handleInputConfirm(scope.row)">
                 </el-input>
                 <!-- 添加的按钮 -->
                 <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"> </el-table-column>
            <el-table-column label="参数名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe="">
            <!-- 展开行 -->
            <el-table-column type="expand"> 
              <template slot-scope="scope">
                 <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close = "handleClose(i, scope.row)">{{item}}</el-tag>
                 <!-- 输入的文本框 -->
                 <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                           @keyup.enter.native="handleInputConfirm(scope.row)"  @blur="handleInputConfirm(scope.row)">
                 </el-input>
                 <!-- 添加的按钮 -->
                 <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"> </el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!--添加参数的对话框  -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close = 'addDialogClosed'>
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
         <el-form-item :label="titleText" prop="attr_name">
           <el-input v-model="addForm.attr_name"></el-input>
         </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    
    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close = 'editDialogClosed'>
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品分类列表
      catelist: [],
      //级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',  
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      //被激活的页签的名称
      activeName: "many",
      //动态参数数据
      manyTableData: [],
      //静态属性数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
          attr_name: ''
      },
      //添加表单的验证规则对象
      addFormRules:{
          attr_name:[
              {  required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
      },
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        attr_name:[
              {  required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
      },
    
    };
  },
  created() {
    this.getCatList();
  },
  methods: {
    //获取所有的商品分类列表
    async getCatList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.catelist = res.data;
      console.log(this.catelist);
    },
    //级联选择框中选项变化，会触发这个函数
    handleChanged() {
      this.getParamsData();
    },
    //Tab 页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
    //获取参数的列表数据
    async getParamsData() {
      //console.log(this.selectedCateKeys);证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      //证明选中的是三级分类
      console.log(this.selectedCateKeys);

      //根据所选分类的Id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败！");
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
        //item.attr_vals = item.attr_vals.split(' ');

        //控制文本框的显示与隐藏
        item.inputVisible = false;
        //文本框中输入的值
        item.inputValue = ''
      })

      console.log(res.data);
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    //监听添加对话框的关闭事件（关闭对话框后再打开，就会清空上次输入的数据）
    addDialogClosed(){
        this.$refs.addFormRef.resetFields()
    },
    //点击确认按钮，添加参数
    addParams(){
        this.$refs.addFormRef.validate( async valid => {
            if (!valid) return
            const {data: res} = await this.$http.post( `categories/${this.cateId}/attributes`,{
                attr_name: this.addForm.attr_name,
                attr_sel: this.activeName
            })
            if(res.meta.status !== 201){
                return this.$message.error("添加参数失败！");
            }
            this.$message.success("添加参数成功！");
            this.addDialogVisible = false
            this.getParamsData();
        })
    },
    //点击按钮展示修改的对话框
    async showEditDialog(attr_id){
      //查询当前参数的信息
      this.editDialogVisible = true;
      const {data: res} = await this.$http.get( `categories/${this.cateId}/attributes/${attr_id}`,{
               params: {attr_sel: this.activeName}})
      if(res.meta.status !== 200){
                return this.$message.error("获取参数信息失败！");
      }
      this.editForm = res.data;
    },

    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    editParams(){
       this.$refs.editFormRef.validate( async valid => {
            if (!valid) return
            const {data: res} = await this.$http.put( `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                attr_name: this.editForm.attr_name,
                attr_sel: this.activeName
            })
            if(res.meta.status !== 200){
                return this.$message.error("修改参数失败！");
            }
            this.$message.success("修改参数成功！");
            this.editDialogVisible = false;
            this.getParamsData();
        })
    },
    //根据id删除对应的参数项
    async removeParams(attr_id){
        const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        if(confirmResult !== 'confirm'){
          //用户取消了删除操作
          return this.$message.info('已取消删除！')
        }

        //删除的业务逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
        if(res.meta.status !== 200){
                return this.$message.error("删除参数失败！");
        }
         this.$message.success("删除参数成功！");
         this.getParamsData();   
    },
    //文本框失去焦点，或摁下enter 键 都会触发
    handleInputConfirm(row){
          if(row.inputValue.trim().length === 0){
            row.inputValue = '';
            row.inputVisible = false;
            return
          }
          //如果没有 return 则证明输入了内容，需要做后续处理
          row.attr_vals.push(row.inputValue.trim());
          row.inputValue = '';
          row.inputVisible = false;
          this.saveAttrVals(row);
    },
    //将对attr_vals 的操作，保存到数据库
    async saveAttrVals(row){
         //需要发起网络请求，将数据进行保存
          const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
          });
          if(res.meta.status !== 200){
                return this.$message.error("修改参数项失败！");
            }
            this.$message.success("修改参数项成功！");

    },
    //点击按钮，展示文本输入框
    showInput(row){
        row.inputVisible = true;
        //让文本框自动获得焦点
        //nextTick方法的作用，当页面上的元素被重新渲染之后，才会执行回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    //删除对应的参数可选项
    handleClose(i, row){
        row.attr_vals.splice(i, 1);
        this.saveAttrVals(row);
    }
  },
  computed: {
    //如果按钮需要被禁用，则返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    //当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    //动态计算标题的文本
    titleText(){
        if(this.activeName === 'many'){
            return '动态参数'
        }
        return '静态属性'

    }
  },
};
</script>

<style scoped>
.cat_opt {
  margin-top: 20px;
  margin-bottom: 15px;
}
.cat_opt span {
  margin-right: 15px;
}

.el-tag{
  margin-right: 20px;
}

.input-new-tag{
  width: 120px;
}
</style>